Has anyone used anything like this? Looking to jack up the rear of my rear on my 89 FZR400. Any input would be great!

Projection Components do dog bones for this - although I'd say to make sure your suspension is sorted first. I dropped the forks through the yokes 20mm and didn't notice a lot of difference, probably down to the springs.

I am considering buying the dog bones too, but I want to rebuild my shock first.
Wow I checked the costs for all the rear axle bearings at CMSNL! They are like 40 euro each and I believe there are 8 of them!
Does anyone know a bearing suplier where they are cheaper?

http://simplybearings.co.uk/shop/

There's a code on the bearing which gives internal and external dia give them a ring and quote the code or sizes